I knew that for a long time, and it bugged me how Funnyjunk seemingly wasn't able to figure it out, if a certain person hates everyone, you will feel more special if that person likes you. The same goes for guys who hit on multiple women, then he lies to one of them how she's the only one, and boom she feels special.

Yeah, but it starts before that, because they're attracted to them before they're together.

Assholes are a challenge. "I got loved in the end by the guy who hates everyone" and that is special and very challenging. That's what sparks attraction, I guess. "I got the attention from the only guy that is almost imposible to get attention from"